<?php

/**
 * CRegularExpressionValidator class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CRegularExpressionValidator validates that the attribute value matches to the specified {@link pattern regular expression}.
 * You may invert the validation logic with help of the {@link not} property (available since 1.1.5).
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.validators
 * @since 1.0
 */
class CRegularExpressionValidator extends CValidator {

    /**
     * @var string the regular expression to be matched with
     */
    public $pattern;

    /**
     * @var boolean whether the attribute value can be null or empty. Defaults to true,
     * meaning that if the attribute is empty, it is considered valid.
     */
    public $allowEmpty = true;

    /**
     * @var boolean whether to invert the validation logic. Defaults to false. If set to true,
     * the regular expression defined via {@link pattern} should NOT match the attribute value.
     * @since 1.1.5
     * */
    public $not = false;

    /**
     * Validates the attribute of the object.
     * If there is any error, the error message is added to the object.
     * @param CModel $object the object being validated
     * @param string $attribute the attribute being validated
     */
    protected function validateAttribute($object, $attribute) {
        $value = $object->$attribute;
        if ($this->allowEmpty && $this->isEmpty($value))
            return;
        if ($this->pattern === null)
            throw new CException(Yii::t('yii', 'The "pattern" property must be specified with a valid regular expression.'));
        if ((!$this->not && !preg_match($this->pattern, $value)) || ($this->not && preg_match($this->pattern, $value))) {
            $message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} is invalid.');
            $this->addError($object, $attribute, $message);
        }
    }

    /**
     * Returns the JavaScript needed for performing client-side validation.
     * @param CModel $object the data object being validated
     * @param string $attribute the name of the attribute to be validated.
     * @return string the client-side validation script.
     * @see CActiveForm::enableClientValidation
     * @since 1.1.7
     */
    public function clientValidateAttribute($object, $attribute) {
        if ($this->pattern === null)
            throw new CException(Yii::t('yii', 'The "pattern" property must be specified with a valid regular expression.'));

        $message = $this->message !== null ? $this->message : Yii::t('yii', '{attribute} is invalid.');
        $message = strtr($message, array(
            '{attribute}' => $object->getAttributeLabel($attribute),
        ));

        $pattern = $this->pattern;
        $pattern = preg_replace('/\\\\x\{?([0-9a-fA-F]+)\}?/', '\u$1', $pattern);
        $delim = substr($pattern, 0, 1);
        $endpos = strrpos($pattern, $delim, 1);
        $flag = substr($pattern, $endpos + 1);
        if ($delim !== '/')
            $pattern = '/' . str_replace('/', '\\/', substr($pattern, 1, $endpos - 1)) . '/';
        else
            $pattern = substr($pattern, 0, $endpos + 1);
        if (!empty($flag))
            $pattern .= preg_replace('/[^igm]/', '', $flag);

        return "
if(" . ($this->allowEmpty ? "jQuery.trim(value)!='' && " : '') . ($this->not ? '' : '!') . "value.match($pattern)) {
	messages.push(" . CJSON::encode($message) . ");
}
";
    }

}
